Hot Racing rally spec progressive rate rear shock springs for the TRA Slash 4X4, Stampede 4X4, and related vehiclesFEATURES: – Spring steel constructionYOU WILL RECEIVE: – Two (2) soft red springs, 4lb/14lb- Two (2) medium chrome springs, 4lb/15lb- Two (2) firm blue springs. 4lb/16lbREQUIREMENTS: – InstallationSPECIFICATIONS: – Free length: 63mm- Outer diameter: 18mm- Inner diameter: 15.5mm- Wire diameter: 1.4mm- Truns: 15 (soft red), 14 (medium chrome), 13 (firm blue)COMMENTS: – Available Hot Racing front springs: SLF48FS261 (factory spec progressive rate), SLF48MR268 (linear rate), SLF48RS286 (rally spec progressive rate)- Available Hot Racing rear springs: SLF63FS261 (factory spec progressive rate), SLF63MR268 (linear rate), SLF63RS286 (rally spec progressive rate)description revised by: SN December 17, 2018